Improved tanners  leach



UNITED STATES lPATENT OFFICE.

sIMoNsNYDEn, or CINCINNATI, oHIo.

. IMPRovED TANNERS LEAcH.

Specilication forming Apart of Letters Patent No. 87,119, dated February 23, 1,869.

' structed and poised vessel with perforated partitions to form compartments, wherein wellground tan-bark or similar material is retained, leached, washed, and drained, secure from open contact with atmospheric air at the will of the operator during the process.

To enable others skilled in the art to make and use my invention, I hereby declare the following to be a full andy exact description, reference being had to the accompanying drawings, making part ofv these specifications, like letters referring to like parts.

Figure 1 shows, in perspective, a vessel constructed mainly of well-seasoned plank, well 'jointed and fitted, closed and clamped by the tie-bolts G G G G and F F, passing through the ends D D and bars HH H H H H H' H. The letters E E represent trunnions to t in proper bearings, so as to poise the vessel in equilibrium or nearly so. B represents the top or cover, A the side, C the bottom, and D D -the ends, of the vessel.

Fig. 2 shows a vertical section ofthe vessel. L Ll LlI represent the perforated partitions in planes parallel to the top and bottom, or`

nearly so, secured in position by the supportl ing-strips marked M, fitted in notches formed in the corner-strips placed within the vessel. Two compartments are thus formed, which are subdivided into four compartments by the perforated partitions K K' shown in Fig. 3, fitted in, to divide in the direction of the length and in a plane at right anglesto the planes of the partitions L L' L.

Dierent 'shapes and proportions may be employed for thev vessel, or technically the leach ,77 but I prefer and recommend the rectangular shape, with a length equal to the sum of the width and height, having the interior spaces above and below the compartments nearly equal to each other, and about equal with each subdivided compartment in cubic capacity.

A taphole with a plug or cock must be provided to draw off or admit the liquor or water, as the process needs.

Man-holes and plates may be substituted for the movable cover.

In order to place the vessel in operative condition, itis poised, as already stated, so as to be readily turned to any desired position. The cover,being uppermost, is removed, and all the partitions except L and K. Ground tan-bark is then lled in to the level of the partition L', which, together with the partition K', is placed in its respective position, and ground tan-bark again filled in to the level of the partition L", which is then secured in position, closing in the contents of the'compartments, leaving a void space below ready for the reception of the rst liquid as it percolates through the intersticesV and channels formed in the bark, and through the perforated partitions, until it reaches the level of the partition L.

The cover, itted for luted joints or packing, is thenreplaeed and secured by the tie bolts and bars.

The void space left within the vessel between the partition L and the cover becomes, alternately with the space before described, the receptacle of the liquidwhen the vessel is turned half over, as must be frequently done as soon as the bark is sueiently soaked and softened to yield its qualities-say, at beginning the process, once anhour or oftener, then gradually lengthening the intervals to the end of the process.

The disturbance and breaking up of the mass of bark within the compartments formnew interstiees and channels, through which theliquid flows, and compels a yield of extractive matter not otherwise obtained, as will be exhibited in the shrinkage of the bulk of tanbark.

If great strength of liquor Vis required, the Y compartments must be replenished with fresh tan-bark.

When the liquor has obtained the proper degree of .strength or the bark has been exA hausted, the liquor is drawn off and thebark well washed and drained before being discharged from the leach, the contents of the compartments being thus leached Without being injuriously aected by prolonged exposure to atmospheric air.

My new-leach admits of the employment of a circulating-pump and of liquid at elevated temperatures possessing greater solvent power.

Having thus described the manner of making and using my invention, what I c1aim,and desire to secure by Letters Patent, is-

1. A leach capable of being so poised as to admit of the necessary change of position, and having intermediate compartments, substantially as described.

2. Also, in combination therewith, the trunnions E E, when employed to sustain the entire structure and contents, in the manner and for the purposes set forth in the foregoing specifications.

SIMON SNYDER. Witnesses J AMES MOORE,

MORITZ B. PHILIPP. 

